[time-nuts] Help identifying oscillator

[K. Szeker]

Hi all,
hese is a Synchron TDMA, or a DBS frequency...
http://www5e.biglobe.ne.jp/~kaorin57/Synchronous%20TDMA%20Direct%20Satellite%20Broadcasting%20Network%20%28English%29.pdf
http://ieeexplore.ieee.org/Xplore/login.jsp?url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F8429%2F26550%2F01182532.pdf%3Farnumber%3D1182532&authDecision=-203
Regards,
Karesz

2010/11/28 Magnus Danielson <magnus at rubidium.dyndns.org>

> On 11/28/2010 09:42 AM, Poul-Henning Kamp wrote:
>
>> In message<75891FAD-425D-4081-999A-3864A6057209 at standingwave.org>, Peter
>> Loron
>>  writes:
>>
>>  Hello folks. I have a box of oscillators that I'm trying to get the
>>> datasheet for. Google and the CTS website haven't been helpful.
>>>
>>> Most interestingly, this thing has 5 pins. The label on the box says the
>>> customer was Agilent.
>>>
>>> Any ideas? Thanks.
>>>
>>
>> The frequency sounds like something that could be related to SONET
>> communications...
>>
>
> Doesn't match up very well... 42,192 MHz doesn't have suitably even numbers
> to any of the rates. Factorisation gives
>
> 42192 kHz = 2^4 * 3^2 * 293 kHz
>
> The SDH/SONET rate of 155,52 Mb/s breaks up as
>
> 155520 kHz = 2^7 * 3^5 * 5 kHz
>
> Other SDH/SONET clocks is /3, /8, *4, *16, *64, *256 variants of the above,
> and sometimes for internal use other sub-divisions. The /8 variant is often
> seen as 19,44 MHz.
>
> I can't come up with a suitable PDH rate either.
>
> We are looking for a system where 293 turns up, and SDH/SONET isn't it.
>
> Cheers,
> Magnus - does SDH/SONET clocking for a living
>
>
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